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Balance of Brain Oxytocin and Vasopressin: Implications For Opinion Balance of brain oxytocin and vasopressin: implications for anxiety, depression, and social behaviors 1 2 Inga D. Neumann and Rainer Landgraf 1 Department of Behavioral and Molecular Neurobiology, University of Regensburg, Regensburg, Germany 2 Max Planck Institute of Psychiatry, Munich, Germany Oxytocin and vasopressin are regulators of anxiety, ([5] for review of human data), for opposing effects of OXT stress-coping, and sociality. They are released within and AVP on the fine-tuned regulation of emotional behav- hypothalamic and limbic areas from dendrites, axons, ior. Specifically, OXT exerts anxiolytic and antidepressive and perikarya independently of, or coordinated with, effects, whereas AVP predominantly increases anxiety- secretion from neurohypophysial terminals. Central oxy- and depression-related behaviors. We will therefore put tocin exerts anxiolytic and antidepressive effects, where- forward the hypothesis that a dynamic balance between as vasopressin tends to show anxiogenic and depressive the activities of brain OXT and AVP systems impacts upon actions. Evidence from pharmacological and genetic hypothalamic and limbic circuitries involved in a broad association studies confirms their involvement in indi- spectrum of emotional behaviors extending to psychopa- vidual variation of emotional traits extending to psycho- thology. pathology. Based on their opposing effects on emotional behaviors, we propose that a balanced activity of both Central release patterns of OXT and AVP: coordinated brain neuropeptide systems is important for appropriate and independent secretion into blood emotional behaviors. Shifting the balance between the Following their neuronal synthesis in the hypothalamic neuropeptide systems towards oxytocin, by positive supraoptic (SON) and paraventricular (PVN) nuclei (OXT, social stimuli and/or psychopharmacotherapy, may help AVP), or in regions of the limbic system (AVP), both to improve emotional behaviors and reinstate mental neuropeptides are centrally released to regulate neuronal health. processes in a spatially and temporally fine-tuned manner. As neurotransmitters, following release from axon term- Introduction inals they contribute to the synaptic mode of rapid infor- Over the past years, substantial progress has been mation processing via hard-wired neuronal connections achieved with respect to our neurobiological understand- [1,8]. A complementary mode of OXT and AVP release is ing of the link between anxiety and stress-coping, on the non-synaptically from dendritic, somatic, and non-termi- one hand, and social behaviors on the other. A dynamic nal axonal regions of the neuronal membrane [1,9] interplay of genetic, epigenetic, and environmental factors (Figure 1). Upon diffusion to nearby or remote receptors orchestrates both individual behavioral variations and the via the extracellular fluid (ECF) and ligand binding, the etiology of anxiety- and depression-related disorders. De- association of the OXT receptor (OXTR) and the AVP spite this progress, available treatment options are far receptor (AVPR) subtypes AVPR1A and AVPR1B with from being mechanism-based, which explains the need specific intraneuronal signaling cascades determines their for innovative therapeutic interventions. One focus of acute or long-term effects [10–12]. Whereas the quality of modern psychiatric research for future therapies has been neuropeptide-induced effects is primarily determined by on neuropeptide systems, with oxytocin (OXT) and argi- localization of their receptors in distinct, particularly hy- nine vasopressin (AVP) featuring prominently in such pothalamic and limbic, brain areas [10], local concentra- endeavors [1–5]. The synthesis and release of OXT and tion of the neuropeptide ligand in the ECF and receptor AVP within the brain are driven by anxiogenic, stressful, density are the major determinants of the intensity and and notably social (both positive and negative) stimuli duration of such actions. Importantly, OXT and AVP [1,6]. In turn, once released, both neuropeptides are key actions may partly overlap, due to >85% homology be- regulators of anxiety-related behavior, passive versus ac- tween their receptors, and this has both physiological and tive stress-coping as an indicator of depression-like behav- pharmacological implications [13,14]. ior, and multiple aspects of social behavior [1–4,7]. Simultaneous microdialysis and blood sampling has pro- We here discuss experimental evidence, primarily from vided evidence for both coordinated and independent rodents, but with complementary data from human studies release of OXT and AVP within the brain, and from neuro- hypophysial terminals into blood (Figure 1), and these seem Corresponding author: Neumann, I.D. ([email protected]) to be both stimulus-dependent and peptide-specific [1,15]. Keywords: anxiety; depression; neuropeptide balance; oxytocin; social behavior; Providing evidence for coordinated release, numerous vasopressin 0166-2236/$ – see front matter ß 2012 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.tins.2012.08.004 Trends in Neurosciences, November 2012, Vol. 35, No. 11 649 Opinion Trends in Neurosciences November 2012, Vol. 35, No. 11 Blood circulation Blood-brain barrier ? Limbic regions ECF Brain OXTR CSF Nasal PVN, AN OXT SON Socio- emotional ? behaviors Key: Endogenous OXT Median eminence Exogenous OXT OXTR in brain and periphery Pituitary Blood circulation Peripheral OXTR Labor, milk ejection TRENDS in Neurosciences Figure 1. The brain oxytocin (OXT) system: neuronal projections, release, receptor-mediated effects, and external application. Physiologically, OXT is secreted as a neurohormone into the bloodstream from axon terminals of magnocellular hypothalamic OXT neurons via neurohemal contacts within the posterior pituitary upon stimulation (e.g., birth, suckling, stress). These neurons may also target brain (e.g., limbic) regions via axon collaterals [8]. In addition to release from axon terminals as a neurotransmitter, central release of OXT as a neuromodulator was shown to occur from dendrites and perikarya [1,9], explaining basal and stimulated levels in the extracellular fluid (ECF) of distinct brain regions, as well as spatially and temporally precise point-to-point signaling. Central release can occur both independently of, and simultaneously with, peripheral secretion. Together with the regional distribution and density of OXT receptor (OXTR), the amount of locally released OXT largely determines the activity of the brain OXT system, thus contributing to the regulation of emotional and social behaviors [7]. Brain OXT availability can be further raised by intranasal administration of OXT; exogenous OXT reaches both the cerebrospinal fluid (CSF) of brain ventricles and the systemic circulation [110,111]. From CSF, synthetic neuropeptides may readily diffuse through the ventricular ependyma into the ECF according to the concentration gradient; blood–brain barrier (BBB) transport (Box 1) may, to some extent, augment brain neuropeptide levels in a concentration-dependent manner [1]. Although exemplified for the brain OXT system in this cartoon, there is substantial evidence for a comparable neurobiology of the brain arginine vasopressin (AVP) system with respect to neuronal synthesis, central release, peripheral secretion, and external application [1]. Abbreviation: AN, accessory magnocellular nuclei. physiological stimuli trigger both central and peripheral Accordingly, changes in neuropeptide concentrations in OXT release, including birth, suckling, sexual activity, human plasma, saliva, or urine in a behavioral context and various forms of stress, with essentially synergistic need to be interpreted with caution. Uncertainties as to the behavioral and physiological actions of centrally (maternal site and dynamics of central release, and whether altered behavior, sexual behavior, anxiolysis, social preference, and levels reflect causes or consequences of behavioral altera- recognition) and peripherally (labor, milk ejection, orgasm) tions, limit their plausibility. In contrast to the separation released OXT, respectively [15,16]. Magnocellular OXT neu- of central from peripheral compartments by the blood– rons projecting to the posterior pituitary, but also targeting brain barrier (BBB) (Box 1), these neuropeptides may limbic regions via axon collaterals [8], may explain such readily diffuse between brain ECF and ventricular cere- coordinated release. brospinal fluid (CSF) (Figure 1). Therefore, quantification Although these findings speak in favor of plasma in the CSF provides at least a global measure of neuropep- OXT as being a global biomarker of central OXT tide activity in the brain, and affords a more accurate system activity, the temporal dynamics of central and reflection of central release patterns [1]. Importantly, in peripheral release may substantially differ in a stimulus- any body fluid, questions about the reliability of neuropep- dependent way. Moreover, various stressors have been tide measurements must be raised. Until assays are shown to trigger OXT (and AVP) release within hypo- strictly validated and standardized to detect bioavailable thalamic and limbic regions, whereas neuropeptide neuropeptide, interpretation of data (particularly from secretion into blood remains virtually unchanged commercial assays without extraction) remains vague at [1,15,16]. best. 650 Opinion Trends in Neurosciences November 2012, Vol. 35, No. 11 Box 1. OXT, AVP, and the blood–brain
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